The technique of photographing objects observed under a microscope is discussed in this succinct site. Various pictures taken under a microscope are displayed on this site as well.

With its clickable map, this site provides text and graphics on spreading boundary, converging boundary, subduction zone, transverse boundaries and faults.

The battering ram was a large beam, made of the trunk of a tree, and having a mass of bronze or iron fastened to one end, and resembling a ram's head. This shape, as well as its name, was given to the engine in question, on account of...